Does the medium or the sound source determine the intensity (initial)?

sound source

Does the medium or the sound source determine the propagation speed?

medium

Does the medium or the sound source determine the period?

sound source

Does the medium or the sound source determine the power?

sound source

Does the medium or the sound source determine the amplitude?

sound source

Which of the following can be changed by the sonographer? wavelength, frequency, intensity, propagation speed, period, power, amplitude (initial)

intensity, power and amplitude

True or False.
A wave with a frequency of 15,000 MHz is ultrasonic.

True. It is greater than 20,000 Hz

True or false.
If the amplitude of a wave is increased to 3 times its original value, the intensity is increased by 6 times.

False. Intensity is proportional to the amplitude squared, if amplitude is tripled, we increase the intensity by a factor of 9

What best describes the line identified by the letter A?
A. amplitude
B. frequency
C. period
D. wavelengthE. peak-to-peak amplitude

E. peak-to-peak amplitude

(this multiple choice question has been scrambled)

What best describes the line identified by letter B?
A. amplitude
B. peak-to-peak amplitude
C. frequency
D. wavelength
E. none of the above

E. none of the above

What best describes the line identified by the letter C?
A. frequency
B. wavelengthC. amplitude
D. peak-to-peak amplitude
E. none of the above

C. amplitude

(this multiple choice question has been scrambled)

Which of the lines above, A, B, C or D, is most likely to be the reciprocal of frequency?

D.

What best describes the line identified by the letter D?A. wavelength
B. amplitude
C. peak-to-peak amplitude
D. frequency
E. none of the above

A. wavelength

(this multiple choice question has been scrambled)

What best describes the line identified by the letter D?
A. frequencyB. period
C. amplitude
D. peak-to-peak amplitude
E. none of the above

B. period

(this multiple choice question has been scrambled)

Which of the lines above, A, B or C, is the most likely to be determined by the source and the medium?

B.

True or False.
If the power of a wave is halved, the intensity is reduced to one-forth its original value

false, half the power = half the intensity

True or False.
Propagation speed increases as frequency increases.

false, frequency is unrelated to speed

Medium 1 has density of 9 and stiffnesss of 6.
Medium 2 has density of 8 and stiffness of 6.
In which medium will sound travel faster?

Medium 1, since both have same stiffness, the one with the greater density has the lower propagation speed

Which of the following characteristics will create the fastest speed of sound?
A. high density, high stiffness
B. low density, high stiffness
C. high density, low stiffness
D. low density, low stiffness

B.

Speed is inversely proportional to density and directly proportional to stiffness

Which of the following characteristics will create the slowest speed of sound?
A. high density, high stiffness
B. low density, high stiffness
C. high density, low stiffness
D. low density, low stiffness

C.

Speed is inversely proportional to density and directly proportional to stiffness

If the power in a beam is 1 watt and the area is 5 cm2, what is the beam's intensity?
A. 5 W/cm2B. 1 W/cm2C. 0.2 W/cm2
D. 1 watt

C.

Intensity = watts/area

If intensity remains the same while the power is doubled, what happened to the beam area?

doubled, if the intensity remains unchanged, then whatever happened to the power has to happen to the area.

A sound beam travels a total of 10 cm in 2 seconds. What is the speed of the sound?

5 cm/sec

True or False.
Propagation speed increases as frequency increases.

False

True or False.
Propagation speed increases as frequency decreases.

False

True or False.
Propagation speed does not change as frequency increase